.box4{
    height:500px;
    overflow: hidden;
    position: relative;
}
.box4 .bigImg{
}
.box4 .shadowBox{
    margin: 40px;
    position: relative;
}
.box4 .shadowBox .mask{
    width: 100px;
    height: 100px;
    background-color: gray;
    opacity:0.6;
    position: absolute;
    display: none;
}
.box4 .imgUl li{
    float: left;
    margin-left: 20px;
}
.box4 .magnify{
    width: 300px;
    height: 300px;
    float: right;
    margin-right:200px;
    margin-top:-300px;
}